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Lesson 1: Measuring center in quantitative data. Statistics intro: Mean, median, & mode. Mean, median, & mode example. Mean, median, and mode. Calculating the mean.
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Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions.
Examples of factors: In the term 8 x , the factors are 8 and x . In the term c d e , the factors are c , d , and e .
Our sample variance here-- so let me draw a sample variance-- we're going to take the weighted sum of the square differences from the mean and divide by this minus 1. So we can get the best estimator of the true variance.
If I take a sample, I don't always get the same results. However, sampling distributions—ways to show every possible result if you're taking a sample—help us to identify the different results we can get from repeated sampling, which helps us understand and use repeated samples. Explore some examples of sampling distribution in this unit!
The Mean Value Theorem states that if a function f is continuous on the closed interval [a,b] and differentiable on the open interval (a,b), then there exists a point c in the interval (a,b) such that f'(c) is equal to the function's average rate of change over [a,b].
Sal calculates the mean and variance of a Bernoulli distribution (in this example the responses are either favorable or unfavorable).
Practice calculating and interpreting the mean and standard deviation of a discrete random variable.
Unit 9: Proportional relationships. Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501 (c) (3) nonprofit organization. Donate or volunteer today!